The silicon suboxide (SiO) anode material is considered to be a promising anode material of Lithium-ion batteries (LIBs), because of its high theoretical capacity. However, there are severe problems for SiO, including the huge volume change (200%), the low electrical conductivity and the low first Coulombic efficiency. In order to solve those problems, a ternary composite ((SiOx/G/SnO2)@C) (G denotes

Lithium sulfide (Li2S) is a promising cathode material with a high theoretical capacity (1166 mA h g−1) that can be paired with nonlithium-metal anodes, which can eliminate the safety issue related with lithium anode. Nevertheless, its poor electronic conductivity and low Li ion diffusion lead to the high activation barrier of Li2S and sluggish kinetic conversion to polysulfides, hindering its commercialization

In this study we propose the use of an iron/nitrogen co-doped reduced graphene oxide (Fe/N-rGO) based electrode as a cathode for a future glucose biofuel cell application. We used a mechanical compression process to fabricate cathodes in the form of pellets. We studied electrocatalytic activity toward oxygen reduction of the cathode under physiological solution conditions. Our results demonstrated

Single particle model (SPM) is an electrochemical model which can be used with energy balance to calculate the state of charge, terminal voltage, and temperature of the battery. The conventional SPM neglects the lithium-ion dynamics in the electrolyte, and the energy balance usually does not consider the heat transfer delay from the battery center to the surface. These lead to model errors when SPM

A two-dimensional heterostructure, combined with the collective advantages of single building blocks, has attracted considerable interest as a new paradigm in the materials design of electrochemical energy storage. In the present study, a sandwich-like CoNi2S4/Ti3C2Tx heterostructure electrode was successfully acquired using a simple one-step hydrothermal procedure, where CoNi2S4 nanosheets are distributed

Lithium-sulfur (Li-S) batteries with high specific capacity are expected to play important roles in next-generation high-energy-storage systems. However, uncontrollable shuttle effect of Li polysulfide (LiPS) and safety concerns still hinder their applications. Herein, we report an in-situ formed asymmetric gel polymer electrolyte (AGPE) fabricated through a novel and low-cost strategy. In cases of

Materials with diamond-like structure possess large cavity sites for excess lithium ions, making them have good lithium-ion transport properties. In this work, first-principles calculations are applied to study the structurally thermal stability, electrochemical stability, and lithium-ion migration kinetics of this class of materials. Our calculation results screen out four very promising solid state

Transition metal polysulfides/oxides typically perform high reversible capacities in sodium-ion batteries/capacitors (SIBs/SICs), but low conductivity and slow redox reaction kinetics are still the main challenges for achieveing fast kinetics. Here, we construct the VS4/Nb2O5/GO composite structure, which can promote the overall conductivity and structural stability through the GO and VS4 bonding (V-C

The aqueous battery employing multivalent metal ions as charge carriers is theoretically a high energy density electrochemical energy storage device due to the fact that it carries more charges. However, the storage mechanism of multivalent metal ions, especially Al3+ ions, in TiO2 materials has not been established. A new model associated with the contribution of multivalent metal ions, water molecules

The surface admittances calculated from electrochemical impedance spectra are used to analyze the surface states of X-MoS2 (X=Fe, Co, Ni) prepared on graphite felt. Because of the semiconducting properties of Fe-MoS2 at the electrolyte-semiconductor interface, the bifunctional catalytic properties in the hydrogen/oxidation evolution reactions (HER/OER) are enhanced as a result of better surface adsorption/desorption

Despite the great potential of nano-alloying anodes to prominently increase the electrochemical performance in sodium ions batteries, the low-cost and mass-produced methods, as well as the optimization design of alloy-based composites are still needed. Herein, a simple but effective electrospinning method is used to fabricate Sb/P@C composite nanospheres with adjustable P, Sb ratio and uniform morphology

Electrochemical behavior of gold, palladium and platinum as anode materials was studied in a molten chloride media CaCl2 – CaO (0–2 wt%) at 850 °C in order to determine the feasibility of their use as oxygen evolving anodes for electro-deoxidation processes such as the Fray-Farthing-Chen (FFC) Cambridge and Ono and Suzuki (OS) processes. Linear sweep voltammetry measurements and constant current electrolyses

The construction of bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is significant for developing water splitting technology. The carbon-based non-noble metal catalysts could be regarded as a preferred alternative to Pt-based materials in water splitting, but very rarely Pt-like activity has been obtained by non-noble metal catalysts. Herein

Herein, we report the synthesis of MXene/VS2 composites for asymmetric supercapacitors using a hydrothermal method. Impressively, the resulting MXene/VS2 electrode shows an outstanding specific capacity of 895.7 C g−1 (1791.4 F g−1) at 1 A g−1, rate capability (587.5 C g−1 (1175.0 F g−1) at 20 A g−1), and cycle performance (90.6% capacity retention after 10000 cycles), owing to its specific microstructures

Lithium-sulfur (Li-S) battery is a promising high-energy density device. However, the shuttling of lithium polysulfide (LiPS) and severe volume variation of sulfur has hindered its the practical application. Herein, a nitrogen-doped micro-mesoporous Co/NC-TiO2 composite derived from a cobalt-doped MIL-125 is prepared as efficient multifunctional sulfur host. In the design of this composite, abundant

Passivity of 2205 duplex stainless steel (DSS) with different surface pre-conditionings was investigated in thiosulfate-containing solutions using electrochemical tests, time-of-flight secondary ion mass spectrometry (ToF-SIMS) and density functional theory (DFT). While thiosulfate had no effect on air-passivated DSS in the primary passive range, it influenced fresh DSS when the air-passivated film

Unraveling the elusive electrokinetics and energetics of the sluggish Oxygen Reduction Reaction (ORR) is critical for the development of efficient Proton Exchange Membrane Fuel Cells (PEMFCs). Physical microkinetic modeling, Transition State Theory (TST), Transmission Line Modeling and Degree of Rate Control (DRC) analysis was employed to simulate analytically both the experimental Electrochemical

Mn-based layered oxides exhibit high theoretical capacity and are environmentally friendly. However, the Mn2+ dissolution and structural degradation during the cycling process result in performance decay. Herein, interface engineering using an artificial Al2O3 coating layer was proposed to improve the performance of the K0.5MnO2 material. This Al2O3 protective layer acts as a barrier to avoid direct